When in a conversation, if you type:
/patchou You get a picture of the creator, with the message: "Thank you for using this software. The best reward I can get for my work is to see you highly satisfied. Sincerely, PaTchou."
The other person must have Messenger Plus! To be able to hear the sound effects.
/sbrb You get "Be right back" in the conversation, and a sound clip of Arnold Schwarzenegger from Terminator saying: "I'll be back".
/sdoh You get "I'm so stupid" in the conversation and a sound clip of Homer saying "D'oh!"
/sevillaugh You get "Muahahahha" in the conversation and a sound clip of an evil laugh.
/skiss You get "I Love you" in the conversation and a kissing sound.
/shello You get "Hello you!" in the conversation and a sound clip of Mr. Hanky saying "Howdy how!"